TiredLegs;228222 Wrote: 
> I'm sure you are capable of Googling it.

Look, I understand statistics rather well - in fact I teach it in some
of my classes.  There is nothing special about 30, or any other
number.

There's no magic number of trials you need to do.  You do n trials, and
you get the correct answer, say, m times.  Then you use the binomial (in
this case) distribution to determine the probability p that you obtained
that result, or a more extreme one, by random guessing.  1-p is then the
confidence with which you can reject the hypothesis that you were
guessing.

That sounds more complicated than it is, but there you have it.


-- 
opaqueice
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